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20578 (1999 RH149)
Classification: Main-belt Asteroid          SPK-ID: 2020578
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02671307793898806 3.1027e-08  
a 3.012185246102895 1.5561e-08 au
q 2.931720506857078 8.9984e-08 au
i 10.22520623246332 4.5503e-06 deg
node 157.3768328461672 1.8686e-05 deg
peri 108.1758332223441 9.9625e-05 deg
M 93.6841730858887 9.6367e-05 deg
tp 2458703.582067767000
(2019-Aug-08.08206777)
0.00051225 TDB
period 1909.505626311874
5.23
1.4797e-05
4.051e-08
d
yr
n .1885304735631096 1.4609e-09 deg/d
Q 3.092649985348711 1.5977e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1425  
   data-arc span      11417 days (31.26 yr)  
   first obs. used      1989-10-07  
   last obs. used      2021-01-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5093  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:24:15  

Additional Information
 Earth MOID = 1.9331 au 
 Jupiter MOID = 1.94445 au 
 T_jup = 3.224 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.08   n/a E2021B10  
diameter diameter 5.145 km 0.193 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 1.13 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, M.; Trilling, D.E.; et al. (2018) Ap. J. Suppl. Series 237, A19.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.202   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20578 (1999 RH149)          Discovered 1999-Sep-09 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 RH149 = 1989 TK7 = 1998 KT53 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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